It is a small purse with the mouth part of Calcifer as a window to show off all your goodies.
It can hold a small wallet, a mobile phone and more. The string length is adjustable also removable to use as a pouch.

Look for origin of shipment: Only items shipped from within North America are being sold by authorized U.S. Retailers. The product box will have a Bandai Namco warning label, which is proof that you are purchasing an officially licensed ensky product, distributed by its sole and authorized distributor (Bandai Namco) for the U.S. Markets. This product has been thoroughly tested for safety and meets all North American consumer product safety regulations. The affixed label also entitles the purchaser to product support assistance within the United States.